With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccapAppIPInCallNowConn
Cisco Call Applications Application IP In Call Now Connection
1.3.6.1.4.1.9.9.146.1.1.1.1.12
Total number of incoming IP calls connected and handled by this application type at this moment.
Back to CISCO-CALL-APPLICATION-MIB MIB page.
IPHost Network monitor allows you to monitor ccapAppIPInCallNowConn on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.